Good Tuesday Evening.
We are carefully analyzing the area for light precipitation this evening into tomorrow that will likely produce a mix of drizzle, freezing drizzle, and snow. Northern portions of the district will be more likely to see a full transition into all frozen precipitation as the cold air sinks south. Here’s a look at current temperatures and radar across the area showing the mix of snow and drizzle.
You can see temperatures are already at or below freezing for most of the Northern INDOT districts. However, the atmosphere is not saturated all the way up to the snow growth zone throughout the entire night. Here’s a look at a skew-t diagram, or a vertical profile of atmospheric conditions. You can see that saturation is tediously close to the snow growth zone (yellow box), which is why we will likely see freezing drizzle at times and snow at other times.
When snow does fall, we would not rule out a coating that could cover the pavement and grass. We will have to watch the morning as well as models are starting to depict heavier snow squalls that could put down some light accumulations for rush hour and even into the afternoon.
Overall, the moral of the story here is that there is not one precipitation type set in stone for tonight. We will see freezing drizzle at times and all snow at times. Either way, with surface temperatures continuing to drop below freezing, black ice can form quickly and we highly recommend keeping an eye on roads, sidewalks, etc, so you are not caught off guard. Here’s a look at the latest temperature guidance from the HRRR through tomorrow morning. It seems to be handling the cold air sagging south the best at this time.
If you have questions, please do not hesitate to reach out! Have a great night.